Power wrench striking assembly with improved structure

Abstract

The utility model provides a power wrench striking assembly with an improved structure. The power wrench striking assembly solves the problem that an existing power wrench is poor in stability. The power wrench striking assembly of the improved structure comprises a machine shell and a wheel carrier arranged in the machine shell, a shaft body is arranged at the front end of the wheel carrier, a power shaft is fixedly connected to the front end of the shaft body, the shaft body is sleeved with a striking sleeve, a spring assembly is arranged between the striking sleeve and the wheel carrier, and a driving structure capable of enabling the striking sleeve to overcome the elastic force of the spring assembly to move backwards is arranged between the striking sleeve and the shaft body. The spring assembly is composed of two or three springs, the shaft body is sleeved with each spring, and the two ends of each spring act on the striking sleeve and the wheel frame respectively. When the number of the springs is two, the spiral directions of the two springs are opposite; when the number of the springs is three, the spiral directions of the springs on the two sides are the same, and the spiral direction of the spring in the middle is opposite to that of the springs on the two sides. The utility model has good stability.

Description

Technical Field

[0001] The utility model belongs to the field of power tools and relates to a power wrench striking component, in particular to a power wrench striking component with an improved structure. Background Art

[0002] A power wrench is a wrench tool that is driven by an electric motor, pneumatic motor, etc. It has high torque and speed, and can more easily complete operations that require greater force or frequent reciprocating movements. It is especially suitable for large-scale operations or the disassembly and assembly of larger-sized bolts.

[0003] Existing power wrenches include an air wrench and a striking unit thereof disclosed in the China Patent Library (application number: 201620776184.5), wherein the striking unit includes a wheel frame connected to a torque multiplier, a coupling sleeve is sleeved on the wheel frame, a coupling shaft for outputting torque coaxial with the coupling sleeve is provided outside the coupling sleeve, the coupling sleeve and the coupling shaft are respectively provided with matching striking structures, and a lifting mechanism is provided on the wheel frame, the lifting mechanism includes a reset spring located between the wheel frame and the coupling sleeve, a curved groove located on one side of the wheel frame close to the coupling shaft, and an adjusting steel ball located in the curved groove for promoting the movement of the coupling sleeve.

[0004] In the above-mentioned air wrench, there is only one return spring, which not only has poor load-bearing capacity and stability, but is also prone to fatigue aging or breakage, affecting the stability of the power wrench. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a power wrench striking assembly with an improved structure and good stability.

[0006] The purpose of the utility model can be achieved through the following technical solutions: an improved structure of a power wrench striking assembly, comprising a casing and a wheel frame horizontally rotatably arranged in the casing, the front end of the wheel frame is a shaft body, the front end of the shaft body is fixedly connected to the power shaft, and the front side of the casing is provided with a through hole for the front end of the power shaft to extend out; a striking sleeve is sleeved on the shaft body, at least two striking blocks are circumferentially arranged on the front end surface of the striking sleeve, and a linkage block is formed on the outer wall of the power shaft, the striking blocks and the linkage blocks are the same in number and the two are alternately distributed along the circumference of the power shaft; a spring assembly is provided between the striking sleeve and the wheel frame so that the front end surface of the striking sleeve has a tendency to press against the linkage block, and a driving structure is provided between the striking sleeve and the shaft body so that the striking sleeve overcomes the elastic force of the spring assembly and moves backward, characterized in that the spring assembly is composed of 2 or 3 springs, each spring is sleeved outside the shaft body, and the two ends of each spring act on the striking sleeve and the wheel frame respectively; when the number of springs is 2, the spiral directions of the two springs are opposite; when the number of springs is 3, the spiral directions of the springs on both sides are the same, and the spiral direction of the spring in the middle is opposite to that of the springs on both sides.

[0007] The striking sleeve is supported by 2 to 3 springs, and at least two of the springs have opposite spiral directions to form a more stable support system. This not only enhances the operating stability of the power wrench, but also reduces vibration and noise, and enhances the overall experience of the power wrench.

[0008] At the same time, multiple springs are provided. When one spring fails or is damaged, another spring can still maintain part or all of the supporting function, thereby further enhancing the operational reliability of the power wrench.

[0009] In the improved structure of the power wrench striking assembly, the rear end of the striking sleeve is formed with a ring-shaped positioning groove coaxial with the striking sleeve, and the front end of each spring is in the positioning groove and pressed on the bottom wall of the positioning groove. The above design can make the spring run more stably.

[0010] In the above-mentioned improved structure of the power wrench striking assembly, the power shaft and the through hole are contacted and matched through the circumferential surface; an outer ring groove coaxially arranged with the through hole is opened on the inner wall of the through hole, and there are at least two outer ring grooves distributed along the axial direction of the power shaft; an inner ring groove coaxially arranged with the power shaft is opened on the outer wall of the power shaft, and the above-mentioned inner ring groove is provided between two adjacent outer ring grooves; a rubber ring is provided in the outer ring groove, and the inner side wall of the rubber ring is in contact and sealed with the outer wall of the power shaft; and the inner ring groove is filled with lubricating grease.

[0011] The power shaft and the through hole are lubricated by grease filled in the inner ring groove, and rubber rings are provided on both sides of the inner ring groove to prevent leakage of the grease. This not only reduces the relative wear between the power shaft and the casing, but also the rubber ring and the grease cooperate to buffer the impact and vibration of the casing, thereby delaying the aging of the casing and extending the life of the power wrench.

[0012] In the above-mentioned improved structure of the power wrench striking assembly, an annular step is provided on the inner wall of the front end of the through hole, a sealing ring is provided in the annular step, the sealing ring is pressed on the bottom surface of the annular step, and the inner and outer side walls of the sealing ring are in contact and sealed with the outer wall of the power shaft and the side of the annular step respectively. The sealing ring is used to block external dust and other impurities and protect the rubber ring, so as to prolong the life of the power wrench by extending the life of the rubber ring.

[0013] In the above improved structure of the power wrench striking assembly, a mounting hole is axially opened at the rear end of the power shaft, and a shaft portion matching the mounting hole is formed on the front end surface of the shaft body. The shaft portion is inserted into the mounting hole and fixedly connected to the power shaft.

[0014] In the above-mentioned improved structure of the power wrench striking assembly, a cavity is formed between the front end face of the shaft body and the inner wall of the mounting hole, and a heat dissipation hole that connects the inner ring groove to the cavity is penetrated on the bottom wall of the inner ring groove farthest from the front end of the through hole. The cooperation between the heat dissipation hole and the cavity is conducive to heat dissipation of the corresponding inner ring groove, delaying the emulsification speed of the lubricating grease there, so that the purpose of increasing the service life of the power wrench is stably achieved.

[0015] In the above improved structure of the power wrench striking assembly, the mounting hole is a blind hole, and the shaft seals the lower end of the mounting hole so that the cavity contacts the inner ring groove only through the heat dissipation hole to avoid contamination of the lubricating grease.

[0016] In the above-mentioned improved structure of the power wrench striking assembly, the outer wall of the shaft portion is in contact and sealed with the wall of the mounting hole, which has the advantages of simple structure and convenient assembly.

[0017] In the above-mentioned improved structure of the power wrench striking assembly, the heat dissipation hole is a tapered hole, and the diameter of the heat dissipation hole gradually becomes smaller in the direction of the cavity to prevent the lubricating grease from leaking into the cavity through the heat dissipation hole.

[0018] In the above-mentioned improved structure of the power wrench striking assembly, the number of striking blocks and linkage blocks is 3, so as to increase the striking force and thus enhance the performance of the power wrench.

[0019] Compared with the prior art, the power wrench striking assembly of the improved structure has the following advantages:

[0020] 1. The striking sleeve is supported by 2 to 3 springs, and at least two springs have opposite spiral directions to form a more stable support system. This not only enhances the operating stability of the power wrench, but also reduces vibration and noise, and enhances the overall experience of the power wrench.

[0021] 2. Multiple springs are set up. When one spring fails or is damaged, the other spring can still maintain part or all of the supporting function, thereby further enhancing the operating reliability of the power wrench.

[0022] 3. The power shaft and the through hole are lubricated by the grease filled in the inner ring groove, and rubber rings are arranged on both sides of the inner ring groove to prevent the leakage of the grease. This can not only reduce the relative wear between the power shaft and the casing, but also buffer the impact and vibration of the casing with the cooperation of the rubber ring and the grease, so as to delay the aging speed of the casing and extend the life of the power wrench. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of a power wrench.

[0024] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0025] Figure 3 It is a three-dimensional schematic diagram of the connection between the power shaft and the striking sleeve.

[0026] Figure 4 It is a three-dimensional schematic diagram of the spring assembly in the first embodiment.

[0027] In the figure, 1, casing; 1a, outer ring groove; 2, wheel frame; 2a, shaft body; 2a1, shaft; 2b, curved groove; 3, power shaft; 3a, linkage block; 3b, inner ring groove; 3c, heat dissipation hole; 4, striking sleeve; 4a, striking block; 4b, positioning groove; 5, spring; 6, rubber ring; 7, sealing ring; 8, cavity. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Embodiment 1

[0029] like Figure 1 As shown, the power wrench striking unit includes a casing 1 and a wheel frame 2 horizontally rotatably arranged in the casing 1, wherein the front end of the wheel frame 2 is a shaft body 2a, and the axis of the shaft body 2a extends forward and backward, and the rear end of the wheel frame 2 is rotatably arranged in the casing 1 using a bearing.

[0030] Specifically,

[0031] like Figure 1 and Figure 3 As shown, the front end of the shaft body 2a is fixedly connected to the power shaft 3, the power shaft 3 and the shaft body 2a are coaxially arranged, and the front side of the housing 1 is provided with a through hole for the front end of the power shaft 3 to extend out. A striking sleeve 4 is sleeved on the shaft body 2a, and at least two striking blocks 4a are circumferentially arranged on the front end surface of the striking sleeve 4, and the striking blocks 4a and the striking sleeve 4 are an integrated structure. A linkage block 3a is formed on the outer wall of the rear end of the power shaft 3, and the linkage block 3a and the power shaft 3 are an integrated structure. The number of striking blocks 4a and the linkage blocks 3a is the same, and the two are alternately distributed along the circumference of the power shaft 3. A spring component is provided between the striking sleeve 4 and the wheel frame 2 to make the front end surface of the striking sleeve 4 have a tendency to press against the linkage block 3a, and a driving structure is provided between the striking sleeve 4 and the shaft body 2a to enable the striking sleeve 4 to overcome the elastic force of the spring component and move backward. Among them, the driving structure includes two curved grooves 2b circumferentially arranged on the outer wall of the shaft body 2a, and a steel ball is provided in each curved groove 2b. The driving structure is a prior art. For details, please refer to a pneumatic wrench and its striking unit disclosed in the Chinese Patent Library (application number: 201620776184.5), which will not be elaborated here.

[0032] like Figure 1 and Figure 2As shown, the power shaft 3 and the through hole are in contact with each other through the circumferential surface; the inner wall of the through hole is provided with an outer ring groove 1a coaxially arranged with the through hole, and there are at least two outer ring grooves 1a and distributed along the axial direction of the power shaft 3; the outer wall of the power shaft 3 is provided with an inner ring groove 3b coaxially arranged with the power shaft 3, and the inner ring groove 3b is provided between two adjacent outer ring grooves 1a; a rubber ring 6 is provided in the outer ring groove 1a, and the inner side wall of the rubber ring 6 is in contact and sealed with the outer wall of the power shaft 3; the inner ring groove 3b is filled with lubricating grease. In the actual product, the number of outer ring grooves 1a is 3, that is, at this time, the number of inner ring grooves 3b is 2.

[0033] The power shaft 3 and the through hole are lubricated by grease filled in the inner ring groove 3b, and rubber rings 6 are provided on both sides of the inner ring groove 3b to prevent leakage of the grease. This not only reduces the relative wear between the power shaft 3 and the casing 1, but also the rubber ring 6 and the grease cooperate to buffer the impact and vibration of the casing 1, thereby delaying the aging speed of the casing 1 and extending the life of the power wrench.

[0034] Further explanation, an annular step is provided on the inner wall of the front end of the through hole, and the annular step is coaxially arranged with the through hole. A sealing ring 7 is provided in the annular step, and the sealing ring 7 is pressed on the bottom surface of the annular step, and the inner and outer side walls of the sealing ring 7 are in contact and sealed with the outer wall of the power shaft 3 and the side of the annular step respectively. The sealing ring 7 is used to block external dust and other impurities and protect the rubber ring 6, so as to increase the life of the power wrench by extending the life of the rubber ring 6.

[0035] In this embodiment,

[0036] like Figure 1 and Figure 4 As shown, the structure of the spring assembly is as follows: the spring assembly is composed of two springs 5, each spring 5 is sleeved outside the shaft body 2a, the two springs 5 ​​are distributed along the radial direction of the power shaft 3, and the two ends of each spring 5 act on the striking sleeve 4 and the wheel frame 2 respectively. The spiral directions of the two springs 5 ​​are opposite to form a more stable support system, which can not only enhance the operating stability of the power wrench, but also reduce vibration and noise, and enhance the overall experience of the power wrench.

[0037] Further, the rear end of the striking sleeve 4 is formed with an annular positioning groove 4b coaxial with the striking sleeve, and the front end of each spring 5 is located in the positioning groove 4b and pressed on the bottom wall of the positioning groove 4b. The above design can make the spring run more stably.

[0038] The power shaft 3 and the shaft body 2a are connected as follows: a mounting hole is axially opened at the rear end of the power shaft 3, and a shaft portion 2a1 matching the mounting hole is formed on the front end surface of the shaft body 2a. The shaft body 2a is inserted into the mounting hole and fixedly connected to the power shaft 3.

[0039] like Figure 1 and Figure 2 As shown, it is further explained that a cavity 8 is formed between the front end surface of the shaft portion 2a1 and the inner wall of the mounting hole, and a heat dissipation hole 3c is penetrated on the bottom wall of the inner ring groove 3b farthest from the front end of the through hole, which connects the inner ring groove 3b to the cavity 8. With the cooperation of the heat dissipation hole 3c and the cavity 8, it is beneficial to dissipate heat corresponding to the inner ring groove 3b, delay the emulsification speed of the lubricating grease there, and stably achieve the purpose of increasing the service life of the power wrench.

[0040] The mounting hole is a blind hole, and the shaft portion 2a1 closes the lower end of the mounting hole, so that the cavity 8 is in contact with the inner ring groove 3b only through the heat dissipation hole 3c, thereby preventing the lubricating grease from being contaminated.

[0041] In this embodiment, the outer wall of the shaft portion 2a1 is in contact and sealed with the wall of the mounting hole, which has the advantages of simple structure and convenient assembly. The heat dissipation hole 3c is a tapered hole, and the diameter of the heat dissipation hole 3c gradually decreases toward the cavity 8 to prevent lubricating grease from leaking into the cavity 8 through the heat dissipation hole 3c.

[0042] In actual products, the number of striking blocks 4a and linkage blocks 3a is three, so as to increase the striking force and thus enhance the performance of the power wrench. Embodiment 2

[0043] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that: the spring assembly consists of three springs 5, each of which is sleeved outside the shaft body 2a, and the two ends of each spring 5 act on the striking sleeve 4 and the wheel frame 2 respectively; the three springs 5 ​​are radially distributed along the power shaft 3, the spiral directions of the springs 5 ​​on both sides are the same, and the spiral direction of the spring 5 in the middle is opposite to that of the springs 5 ​​on both sides.

[0044] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A power wrench striking assembly with an improved structure, comprising a housing (1) and a wheel frame (2) horizontally rotatably arranged in the housing (1), the front end of the wheel frame (2) being a shaft body (2a), the front end of the shaft body (2a) being fixedly connected to a power shaft (3), and the front side of the housing (1) being provided with a through hole for the front end of the power shaft (3) to extend out; a striking sleeve (4) being sleeved on the shaft body (2a), at least two striking blocks (4a) being circumferentially arranged on the front end surface of the striking sleeve (4), and linkage blocks (3a) being formed on the outer wall of the power shaft (3), the striking blocks (4a) and the linkage blocks (3a) being the same in number and being alternately distributed along the circumference of the power shaft (3); a spring assembly being provided between the striking sleeve (4) and the wheel frame (2) so that the front end surface of the striking sleeve (4) has a tendency to press against the linkage block (3a), and a driving structure being provided between the striking sleeve (4) and the shaft body (2a) so that the striking sleeve (4) can overcome the elastic force of the spring assembly and move backward, characterized in that: The spring assembly is composed of two or three springs (5), each spring (5) is sleeved outside the shaft body (2a), and both ends of each spring (5) act on the striking sleeve (4) and the wheel frame (2) respectively; when the number of the springs (5) is two, the spiral directions of the two springs (5) are opposite; when the number of the springs (5) is three, the spiral directions of the springs (5) on both sides are the same, and the spiral direction of the spring (5) in the middle is opposite to that of the springs (5) on both sides.

2. The power wrench striking assembly with improved structure according to claim 1 is characterized in that: The rear end of the striking sleeve (4) is formed with an annular positioning groove (4b) coaxial with the striking sleeve (4), and the front end of each spring (5) is located in the positioning groove (4b) and pressed against the bottom wall of the positioning groove (4b).

3. The improved structure of the power wrench striking assembly according to claim 1 is characterized in that: The power shaft (3) and the through hole are in contact with each other through a circumferential surface; an outer ring groove (1a) coaxially arranged with the through hole is provided on the inner wall of the through hole, and there are at least two outer ring grooves (1a) distributed along the axial direction of the power shaft (3); an inner ring groove (3b) coaxially arranged with the power shaft (3) is provided on the outer wall of the power shaft (3), and the inner ring groove (3b) is provided between two adjacent outer ring grooves (1a); a rubber ring (6) is provided in the outer ring groove (1a), and the inner side wall of the rubber ring (6) is in contact and sealed with the outer wall of the power shaft (3); and lubricating grease is filled in the inner ring groove (3b).

4. The improved structure of the power wrench striking assembly according to claim 3 is characterized in that: An annular step is provided on the inner wall of the front end of the through hole, a sealing ring (7) is provided in the annular step, the sealing ring (7) is pressed on the bottom surface of the annular step, and the inner and outer side walls of the sealing ring (7) are in contact and sealed with the outer wall of the power shaft (3) and the side surface of the annular step respectively.

5. The improved structure of the power wrench striking assembly according to claim 2 is characterized in that: A mounting hole is axially provided at the rear end of the power shaft (3), and a shaft portion (2a1) matching the mounting hole is formed on the front end surface of the shaft body (2a). The shaft portion (2a1) is inserted into the mounting hole and fixedly connected to the power shaft (3).

6. The improved structure of the power wrench striking assembly according to claim 3 is characterized in that: A cavity (8) is formed between the front end surface of the shaft body (2a) and the inner wall of the mounting hole, and a heat dissipation hole (3c) is penetrated through the bottom wall of the inner ring groove (3b) farthest from the front end of the through hole so that the inner ring groove (3b) is connected to the cavity (8).

7. The improved structure of the power wrench striking assembly according to claim 6 is characterized in that: The mounting hole is a blind hole, and the shaft portion (2a1) closes the lower end of the mounting hole.

8. The improved structure of the power wrench striking assembly according to claim 7 is characterized in that: The outer wall of the shaft portion (2a1) is in contact and sealed with the wall of the mounting hole.

9. The improved structure of the power wrench striking assembly according to claim 6 is characterized in that: The heat dissipation hole (3c) is a conical hole, and the diameter of the heat dissipation hole (3c) gradually becomes smaller in the direction of the cavity (8).

10. The power wrench striking assembly with improved structure according to claim 1, characterized in that: The number of the striking blocks (4a) and the number of the linkage blocks (3a) are both 3.

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